My dog has been having seizures for several years. The vet said that an MRI might not be able to diagnose the disease, so we had to put him under general anesthesia. However, after consistently taking this medication, the frequency of seizures has decreased to about once every six months. I will continue to give it to him, but it is too expensive. I bought it on sale, and I would like to be notified when there is another sale. How can I do that?